新GRE数学重要考点:AT least One

所属专题:GRE数学重要考点  来源:互联网    要点:GRE考试  
编辑点评: 想要攻克新GRE数学,一定要掌握好数学的基础知识点,还要识记有关新GRE数学的词汇。对于新GRE数学中的一系列重要考点,小编都将进行详细分析。今天为大家整理的是关于At least one的内容。

今天针对新版gre数学复习,小编给大家整理的是关于AT least One的相关内容,这些概念在考试中一定会考到的。希望考生能再接再厉,取得一个好成绩,突破新版gre数学难的困境。

AT least One

If probability of event A happening is p and event B happening is q, then the probability that at least one of them happens is (p+q).

Example:

There are 20 quarters, 33 nickels, and 47 pennies in a jar. The probability that a randomly selected coin is a quarter= 20/(20+33+47)=20/100=0.2 and the coin is nickel = 33/100 =0.33.The probability it is either a quarter or a nickel = 0.2+0.33=0.53.

Remember:

The events needs to be mutually exclusive, that is if one happens the other cannot happen: a coin is either a quarter or nickel but not both.

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